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The BMW Range
5 Series
E34
What I discovered and did to overcome fuel consumption problem
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<blockquote data-quote="julianpang" data-source="post: 610136" data-attributes="member: 6542"><p>It has been a while since my last update. I am glad that I have finally solved this issue. </p><p></p><p>I have done many things from changing brand new back box, top overhaul, installed new o2 sensor. All that gave me only slight improvement. </p><p></p><p>About 1 month back, I went to Optimum to get something fixed. Jason was nice enough to plug in his diagnostic machine to see how is the car running. While he was at it, I asked him to look into my o2 sensor (from the diagnostic machine) to see if it is running well. </p><p></p><p>Jason said that o2 function is not functioning at all eventhough I had a o2 sensor plugged in. We concluded that my E34's (standard spec came without o2 sensor) ECU doesn't support o2 sensor eventhough the wire harness was already there. To further confirm this conclusion, Jason pulled out his E34 M50B25's ECU (Japan spec came with o2) from his own car and plugged into mine and o2 function works (showed in the diagnostic). </p><p></p><p>I felt like stricking jackpot that day. I went chop shop hunting for an ECU and I found 1 ECU which came from a halfcut with o2. Damage was $450 which is considered good price.</p><p></p><p>Since then, I have went thru several full tanks.</p><p></p><p>The result: </p><p>Pumped 70 liters ($130 RON95), KL/PJ driving, Ah Pek/auntie driving style, --> 490~500km. (If drive lembu a bit, I will still get above 460km).</p><p></p><p>I have not tested highway driving yet but I will keep this topic updated once I have done outstation driving.</p><p></p><p>I am loving my car more now.</p></blockquote><p></p>
[QUOTE="julianpang, post: 610136, member: 6542"] It has been a while since my last update. I am glad that I have finally solved this issue. I have done many things from changing brand new back box, top overhaul, installed new o2 sensor. All that gave me only slight improvement. About 1 month back, I went to Optimum to get something fixed. Jason was nice enough to plug in his diagnostic machine to see how is the car running. While he was at it, I asked him to look into my o2 sensor (from the diagnostic machine) to see if it is running well. Jason said that o2 function is not functioning at all eventhough I had a o2 sensor plugged in. We concluded that my E34's (standard spec came without o2 sensor) ECU doesn't support o2 sensor eventhough the wire harness was already there. To further confirm this conclusion, Jason pulled out his E34 M50B25's ECU (Japan spec came with o2) from his own car and plugged into mine and o2 function works (showed in the diagnostic). I felt like stricking jackpot that day. I went chop shop hunting for an ECU and I found 1 ECU which came from a halfcut with o2. Damage was $450 which is considered good price. Since then, I have went thru several full tanks. The result: Pumped 70 liters ($130 RON95), KL/PJ driving, Ah Pek/auntie driving style, --> 490~500km. (If drive lembu a bit, I will still get above 460km). I have not tested highway driving yet but I will keep this topic updated once I have done outstation driving. I am loving my car more now. [/QUOTE]
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What I discovered and did to overcome fuel consumption problem
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